A great BPA free vacuum insulated double wall 500ml stainless steel flask and 250ml stainless steel mugs gift set packed in a smooth semi-gloss black cardboard box with a die-cut foam base to hold flask and mugs flask has a stainless lid and push button operation keeps drinks cold for up to 24 hours and hot for up to 12 hours both laser engrave to natural silver etch handwashing is recommended.